63404640436 has 12 divisors (see below), whose sum is σ = 111195721728. Its totient is φ = 31634434232.

The previous prime is 63404640421. The next prime is 63404640437.

It is a happy number.

63404640436 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63404640437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16969396 + ... + 16973131.

It is an arithmetic number, because the mean of its divisors is an integer number (9266310144).

Almost surely, 2^63404640436 is an apocalyptic number.

It is an amenable number.

63404640436 is a deficient number, since it is larger than the sum of its proper divisors (47791081292).

63404640436 is a wasteful number, since it uses less digits than its factorization.

63404640436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33942998 (or 33942996 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 40.

The spelling of 63404640436 in words is "sixty-three billion, four hundred four million, six hundred forty thousand, four hundred thirty-six".